What does Buk mean by this quote?

Question

"There's a bluebird in my heart that wants to get out
but I'm too tough for him,
I say, stay in there, I'm not going to let anybody see you." -Charles Bukowski

Additional Details

My sister-in-law has this as a tattoo on her back and I always meant to ask her what it meant but keep forgetting.

Answer 1

Best Answer - Chosen by Voters

..I like her too...It's my favourite Bukowski poem and you have to hear it read!

.....the bluebird of happiness....
may it fly up your nose

Answer 2

We become vulnerable the moment our most delicate feelings float on the surface.. our foes recognize them as our weak-point.

Answer 3

It's a part of a poem that he wrote. It's about the gentle side that tough men often oppress.

Answer 4

your sister-in-law is awesome !

Answer 5

call her and ask what she thinks.
That way you know what she sees in it